The HGS Interface is a GUI for HydroGeoSphere that has been built into Aquaveo’s flagship Groundwater Modeling System (GMS), one of the world’s premier software packages for subsurface hydrological simulations. With the introduction of the extremely powerful HydroGeoSphere simulation engine, GMS v10.8 users will be able to construct fully-integrated groundwater-surface water models powered by HydroGeoSphere!